Improvement in steam-gages



UNITED STATES THOMAS SHAW, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN STEAM-GAGES.

Specification forming part of Letters Patent No.117,578, datcdMay 2,1865.

To all whom t may concern.-

Be it known that 1, THOMAS SHAW, of the city and county of Philadelphia, Pennsylvania, have invented a new and Improved Mode of Oonstlucting Steam-Gages; and I hereby declare the following to be a full, clear, and eX- nct description ot' the same, reference being had to the accompanying drawings, and to the letters ot' reference marked thereon.

My invention consists in the employment of rubber tubes in the manner and for the purpose as hereinafter described.

ln order to enable others to use and prac tice my invention, I will proceed to describe its construction and operation.

On reference tothe accompanyingdrawings, which form a part of the specification, Figure 1 represents the gage with the dial removed. Fig. 2 represents a front view of `the same. Fig. 3 represents a section, for the purpose of showing location ot' pinion, &c., as hereinafter described.

pinion gearin g into the are on end of said bel1- crank. Said pinion is pivoted to strips m and n and carries the hand t, and is provided with a hair-spring, u, all for the purpose as hereinafter described. The strips m and n are supported by pillars o o, and by screws into the block d. p is a spring secured to the ease at q, and presses in one side of bellcrank 7c; r1', supports for the dial, which is held to same by means of screws. It is intended that the interior ofthe tube shall be iilled with mercury .in order to protect it against the corrosive action of steam, grease, &c.

It will be observed that when pressure is applied on the interior of tube h said tube is free to elongate, which operation iinparts motion to the bellerank, pinion, &c. The spring p oiers resist-ance in proportion to the strength of the spring. The combination of the tube and spring form a gage of pressures in proportion to their size and strength.

It is intended in high pressures to use a metal tube surrounding the gum and wire, for the purpose of preventing the bending ot' the same under heavy pressures.

What l claim, and desire to secure by Let ters Patent, is l The employment of a gum tube in the man ner specified, for the purpose set forth.

THOMAS SHAW. Witnesses:

E. Conn, H. It. J Usrtcn. 

